The Big 4

That is the term for the major labels which over the last 10 years have consolidated from the Big 6.

Universal merged with Polygram to form UMVD in 1999. Sony and BMG in 2004. Here are the Big 4s are some labels under their belts.

UMVD -- Universal Music and Video Distribution

Interscope
Geffen
Island/Def Jam
Universal
UMG Nashville
Hollywood
Disney/Buena Vista

Sony BMG

Columbia
Epic
Arista
J Records
RCA
Jive
LaFace
Razor & Tie
WindUp
RCA Label Group Nashville

WEA -- Warner Music Group

Warner Brothers
Atlantic Records
Bad Boy
Roadrunner
WSM/Rhino
V2 Records

EMD -- EMI Group

Blue Note
Capitol Nashville
Capitol Records
Virgin
EMI Latin

Will be interesting to see how these guys can reinvent themselves with the changing tides of digital singles music consumption.